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William IV, also called (1789–1830) Prince William Henry, Duke Of Clarence, German Wilhelm Heinrich, byname The Sailor King (born Aug. 21, 1765, London—died June 20, 1837, Windsor Castle, near London), king of Great Britain and Ireland and king of Hanover from June 26, 1830. Personally opposed to parliamentary reform, he grudgingly accepted the epochal Reform Act of 1832, which, by transferring representation from depopulated “rotten boroughs” to industrialized districts, reduced the power of the British crown and the landowning aristocracy over the government.

The third son of King George III, he entered the Royal Navy at the age of 13, fought in the American Revolution, and, while serving in the West Indies, formed a close friendship with the future naval hero Horatio (afterward Viscount) Nelson. When he left the sea in 1790, however, he had become unpopular with many other fellow officers and had angered his father by his numerous love affairs. Between 1794 and 1807 he had 10 illegitimate children (surnamed FitzClarence) by the Irish comedienne Dorothea Jordan. His marriage (July 11, 1818) to Princess Adelaide of Saxe-Meiningen produced two daughters, both of whom died in infancy. On William’s death, therefore, the British crown passed to his niece Princess Victoria, and the Hanoverian crown passed to his brother Ernest Augustus, duke of Cumberland.

The Duke became heir presumptive on the death (Nov. 6, 1817) of Princess Charlotte Augusta, only legitimate child of his older brother, the Prince Regent (afterward King George IV, reigned 1820–30). In April 1827 the new prime minister, George Canning, revived for him the office of lord high admiral, but he was forced to resign in August 1828, when the Duke of Wellington was premier. After succeeding George IV as king, William proved to be less brilliant but also less selfish and more attentive to official business than his brother had been.

In May 1832 the prime minister, Charles Grey, the 2nd Earl Grey, asked the King to create at least 50 new peers to overcome the House of Lords majority hostile to parliamentary reform. At first William refused, but after Wellington had failed to form a Tory (Conservative) ministry, Grey’s Whigs resumed office with the King’s written promise to create enough peers to carry the Reform Bill. The Lords, sufficiently threatened, allowed the bill to pass. As a consequence of redistricting, Sir Robert Peel’s Tories were unable to gain a Commons majority in the election of January 1835; and from April of that year the King had to deal with an uncongenial Whig premier, William Lamb, 2nd Viscount Melbourne, whom he had previously dismissed.

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